DevTools: Remove step into selection experiment

Source/devtools/front_end/inspector.css

Index: Source/devtools/front_end/inspector.css
diff --git a/Source/devtools/front_end/inspector.css b/Source/devtools/front_end/inspector.css
index 0052ad58382b40c4b5f307ca28d56c2933ca41de..5bc114cd8cc742c45812c58f87fbbba158f99927 100644
--- a/Source/devtools/front_end/inspector.css
+++ b/Source/devtools/front_end/inspector.css
@@ -2297,17 +2297,6 @@ body.inactive .sidebar-tree-item.selected {
     background-color: rgb(255, 255, 194);
 }
 
-.source-frame-stepin-mark {
-    cursor: pointer;
-    text-decoration: underline;
-}
-
-.source-frame-stepin-mark-highlighted {
-    font-weight: 800;
-    cursor: pointer;
-    text-decoration: underline;
-}
-
 .workers-list {
     list-style: none;
     margin: 0;